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• W2189165004 abstract "Measurements made on samples collected across a prominent zone of cementation occurring at depths below ~400 mbsf at Site suggest that this zone is associated with a 100 fold reduction in hydraulic conductivity. The cements are related to significant smectite and zeolite deposition and cause sharp changes in sonic velocity, porosity, and thermal conductivity. The current pore fluid chemistry profile suggests cementation is continuing in-situ at the present time. to 700 mbsf. Increasing degrees of cementation in this interval allowed the paleo-magnetic drill to be used to collect a series of good quality 2.54 cm diameter cylindrical samples from the split half-core. The data illustrate the interaction between diagenesis and the hydraulic con- ductivity structure in the section beneath the cementation front at -400 mbsf. EXPERIMENTAL APPARATUS AND PROCEDURE The basic features of the constant flow-rate permeameter used to determine the hydraulic conductivities of core samples collected from Site are shown in Figure 2. Prior to the measurements being made the samples were kept moist in sealed containers and stored at 4°C. The ends of the cylindrical hydraulic conductivity samples were cut to the required length and their dimensions are determined prior to being placed in the confining chamber (sample dimensions were approximately 2.54 cm in diameter and 1 to 1.5 cm long). The sam- ples were placed between the upper and lower titanium (selected for its corrosion resistance) platens and an impermeable flexible polyure- thane jacket was cast around the whole sample assembly to isolate the sample from the fluid producing the confining pressure. The sample assembly allows fluids to be pumped along the axis of the sample via ports and inert porous plastic plates at the top and base of the sample assembly. To alleviate problems associated with corrosion in the presence of the artificial saline pore fluid all tubing in the system was replaced with PEEK plastic. The sample assembly was then placed in the confining chamber and the external system pressurized. To force any remaining air into solution, previously de-aired artificial pore fluid was introduced into the internal system and sample, and the system was subsequently back pressured to 0.34 MPa. The major cation composition of the artificial pore fluid was made to correspond to the in-situ values at a particular sample's depth. The fluid compositions used in these mea- surements correspond to those determined from pore fluids extracted from the cores onboard ship (Site 863 chapter in Behrmann, Lewis, Musgrave, et al., 1992). Particular attention was paid to the Na, Mg, Ca, and K concentrations and the pH, the other cations occurred in very small quantities were ignored for the purposes of these tests. Hydraulic conductivity determinations were commonly attempted at more than one flow rate and effective confining pressure to ascer- tain how stable the system was and to assess if hydraulic conductivi- ties changed significantly with effective stress. A constant flow rate was maintained during the hydraulic conductivity tests with a vari- able speed syringe pump, manufactured by Harvard Apparatus, USA. Flow rates are considered to be accurate to ±0.5% at the mid range, and ±2% at the lowest range. The flow pump technique has several advantages over the standard constant head and falling head methods of permeability measurement, the most important being the ease with" @default.
• W2189165004 created "2016-06-24" @default.
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• W2189165004 date "1995-09-01" @default.
• W2189165004 modified "2023-09-24" @default.
• W2189165004 title "Data Report: Hydraulic Conductivity Measurements on Discrete Samples Collected from Leg 141, Site 863" @default.
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• W2189165004 doi "https://doi.org/10.2973/odp.proc.sr.141.039.1995" @default.
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